Sn4As3 revisited: Solvothermal synthesis and crystal and electronic structure

Kovnir, Kirill; Kolen’ko, Yury V.; Баранов, А. І.; Neira, Inés S.; Sobolev, A. V.; Yoshimura, Masahiro; Presniakov, Igor A.; Shevelkov, Аndrei V.

doi:10.1016/j.jssc.2008.12.007

Cited by 27 publications

(20 citation statements)

References 53 publications

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“…The main contribution of halogen p-orbitals to the valence band is located between −1 and −3 eV. To clarify the bonding in the P 7 3− phosphorus clusters, we applied Electron Localization Function (ELF) analysis [22][23][24][25] to the Ba 2 P 7 I compound ( Figure 6). According to the Zintl concept, single covalent 2e-2c bonds are expected to be present at short P-P interatomic separations.…”

Section: Electronic Structurementioning

confidence: 99%

Zintl Salts Ba2P7X (X = Cl, Br, and I): Synthesis, Crystal, and Electronic Structures

Dolyniuk

Kovnir

2013

Crystals

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Two barium phosphide halides, Ba 2 P 7 Br and Ba 2 P 7 I, were synthesized and structurally characterized by single crystal X-ray diffraction. Both compounds crystallize in the monoclinic space group P2 1 /m (No. 11) and are isostructural to Ba 2 P 7 Cl. The crystal structures of Ba 2 P 7 X (X = Cl, Br, I) feature the presence of heptaphosphanortricyclane P 7 3− clusters along with halogen anions and barium cations. According to the Zintl concept, Ba 2 P 7 X compounds are electron-balanced semiconductors. Quantum-chemical calculations together with UV-Visible spectroscopy confirm the title compounds are wide bandgap semiconductors. The bonding in the P 7 3− clusters was analyzed by means of electron localization function. The elemental compositions were confirmed using energy dispersive X-ray spectroscopy.

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Section: Electronic Structurementioning

confidence: 99%

Zintl Salts Ba2P7X (X = Cl, Br, and I): Synthesis, Crystal, and Electronic Structures

Dolyniuk

Kovnir

2013

Crystals

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“…Besides, the sister compound SrSn 2 As 2 , having a crystal structure analogous to NaSn 2 As 2 , has been theoretically suggested to be very close to the topological critical point, hosting three-dimensional Dirac state at the Fermi level 11 , which was experimentally investigated by angle-resolved photoemission spectroscopy 12 . There are various structural analogues with conducting tin-pnictide (SnPn) layers, including Sn 4 Pn 3 13,14 and ASnPn 15–19 , as well as ASn 2 Pn 2 9,10,12,20–22 , where A denotes alkali or alkaline earth metal (see Fig. 1).…”

Section: Introductionmentioning

confidence: 99%

Na1−xSn2P2 as a new member of van der Waals-type layered tin pnictide superconductors

Goto

Miura

Moriyoshi

et al. 2018

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Superconductors with a van der Waals (vdW) structure have attracted a considerable interest because of the possibility for truly two-dimensional (2D) superconducting systems. We recently reported NaSn2As2 as a novel vdW-type superconductor with transition temperature (Tc) of 1.3 K. Herein, we present the crystal structure and superconductivity of new material Na1−xSn2P2 with Tc = 2.0 K. Its crystal structure consists of two layers of a buckled honeycomb network of SnP, bound by the vdW forces and separated by Na ions, as similar to that of NaSn2As2. Amount of Na deficiency (x) was estimated to be 0.074(18) using synchrotron X-ray diffraction. Bulk nature of superconductivity was confirmed by the measurements of electrical resistivity, magnetic susceptibility, and specific heat. First-principles calculation using density functional theory shows that Na1−xSn2P2 and NaSn2As2 have comparable electronic structure, suggesting higher Tc of Na1−xSn2P2 resulted from increased density of states at the Fermi level due to Na deficiency. Because there are various structural analogues with tin-pnictide (SnPn) conducting layers, our results indicate that SnPn-based layered compounds can be categorized into a novel family of vdW-type superconductors, providing a new platform for studies on physics and chemistry of low-dimensional superconductors.

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“…A similar increase in metal solubility was observed in our earlier studies of the synthesis of tin arsenide. 6 NH 4 Cl precipitates can be effectively washed out of the product with water or ethanol. Fe 3 Se 4 (en) 2 appears to be stable against treatment with water and ethanol, however it decomposes in dilute acidic solutions.…”

mentioning

confidence: 99%

Chemical Excision of Tetrahedral FeSe₂ Chains from the Superconductor FeSe: Synthesis, Crystal Structure, and Magnetism of Fe₃Se₄(en)₂

et al. 2013

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Fragments of the superconducting FeSe layer, FeSe2 tetrahedral chains, were stabilized in the crystal structure of a new mixed-valent compound Fe3Se4(en)2 (en = ethylenediamine) synthesized from elemental Fe and Se. The FeSe2 chains are separated from each other by means of Fe(en)2 linkers. Mössbauer spectroscopy and magnetometry reveal strong magnetic interactions within the FeSe2 chains which result in antiferromagnetic ordering below 170 K. According to DFT calculations, anisotropic transport and magnetic properties are expected for Fe3Se4(en)2. This compound offers a unique way to manipulate the properties of the Fe-Se infinite fragments by varying the topology and charge of the Fe-amino linkers.

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Sn4As3 revisited: Solvothermal synthesis and crystal and electronic structure

Cited by 27 publications

References 53 publications

Zintl Salts Ba2P7X (X = Cl, Br, and I): Synthesis, Crystal, and Electronic Structures

Zintl Salts Ba2P7X (X = Cl, Br, and I): Synthesis, Crystal, and Electronic Structures

Na1−xSn2P2 as a new member of van der Waals-type layered tin pnictide superconductors

Chemical Excision of Tetrahedral FeSe₂ Chains from the Superconductor FeSe: Synthesis, Crystal Structure, and Magnetism of Fe₃Se₄(en)₂

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Sn4As3 revisited: Solvothermal synthesis and crystal and electronic structure

Cited by 27 publications

References 53 publications

Zintl Salts Ba2P7X (X = Cl, Br, and I): Synthesis, Crystal, and Electronic Structures

Zintl Salts Ba2P7X (X = Cl, Br, and I): Synthesis, Crystal, and Electronic Structures

Na1−xSn2P2 as a new member of van der Waals-type layered tin pnictide superconductors

Chemical Excision of Tetrahedral FeSe2 Chains from the Superconductor FeSe: Synthesis, Crystal Structure, and Magnetism of Fe3Se4(en)2

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Chemical Excision of Tetrahedral FeSe₂ Chains from the Superconductor FeSe: Synthesis, Crystal Structure, and Magnetism of Fe₃Se₄(en)₂